import pytest
import requests
import json
from typing import Dict, Any, Optional
import time
from unittest.mock import patch
import requests_mock

# 直接设置配置信息 - 请替换为您的真实信息
CONFIG = {
    "secret_id": "your-secret-id",
    "secret_key": "your-secret-key",
    "region": "ap-guangzhou",
    "api_url": "https://cvm.tencentcloudapi.com/",
    "test_placement_group_id": "pg-test-123456",  # 测试用群组ID
    "invalid_placement_group_id": "pg-invalid-123456",  # 无效ID
}


def generate_signature(params: Dict[str, Any]) -> str:
    """生成API请求签名（示例实现）"""
    # 实际使用时需要实现完整的签名算法
    return "mock-signature"


def describe_placement_groups(placement_group_ids: Optional[list] = None,
                              limit: int = 20, offset: int = 0) -> Dict[str, Any]:
    """查询分散置放群组信息"""
    params = {
        "Action": "DescribePlacementGroups",
        "Version": "2017-03-12",
        "Region": CONFIG["region"],
        "Limit": limit,
        "Offset": offset,
        "SecretId": CONFIG["secret_id"],
        "Timestamp": int(time.time()),
        "Nonce": int(time.time() * 1000),
    }

    if placement_group_ids:
        for i, group_id in enumerate(placement_group_ids):
            params[f"PlacementGroupIds.{i}"] = group_id

    params["Signature"] = generate_signature(params)
    response = requests.post(CONFIG["api_url"], data=params)
    return response.json()


# 测试用例
class TestTencentCloudPlacementGroup:
    @pytest.fixture
    def mock_request(self):
        with requests_mock.Mocker() as m:
            yield m

    def test_describe_placement_groups_success(self, mock_request):
        """测试成功查询分散置放群组信息"""
        mock_response = {
            "Response": {
                "PlacementGroupSet": [
                    {
                        "PlacementGroupId": CONFIG["test_placement_group_id"],
                        "PlacementGroupName": "TestGroup",
                        "Strategy": "HOST",
                        "CvmQuotaTotal": 20,
                        "CurrentNum": 5,
                        "CreateTime": "2023-01-01T00:00:00Z"
                    }
                ],
                "TotalCount": 1,
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups()
        assert "Response" in result
        assert "Error" not in result["Response"]
        assert "PlacementGroupSet" in result["Response"]
        assert "TotalCount" in result["Response"]

    def test_describe_specific_placement_group(self, mock_request):
        """测试查询特定分散置放群组"""
        mock_response = {
            "Response": {
                "PlacementGroupSet": [
                    {
                        "PlacementGroupId": CONFIG["test_placement_group_id"],
                        "PlacementGroupName": "TestGroup",
                        "Strategy": "HOST",
                        "CvmQuotaTotal": 20,
                        "CurrentNum": 5,
                        "CreateTime": "2023-01-01T00:00:00Z"
                    }
                ],
                "TotalCount": 1,
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups([CONFIG["test_placement_group_id"]])
        assert "Response" in result
        assert "Error" not in result["Response"]

        group_set = result["Response"].get("PlacementGroupSet", [])
        assert len(group_set) > 0
        assert group_set[0]["PlacementGroupId"] == CONFIG["test_placement_group_id"]

    def test_invalid_placement_group_id(self, mock_request):
        """测试无效的分散置放群组ID"""
        mock_response = {
            "Response": {
                "Error": {
                    "Code": "InvalidPlacementGroup.NotFound",
                    "Message": "The specified placement group does not exist."
                },
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups([CONFIG["invalid_placement_group_id"]])
        assert "Response" in result
        error = result["Response"].get("Error", {})
        assert error
        assert error.get("Code") == "InvalidPlacementGroup.NotFound"

    def test_missing_required_parameter(self, mock_request):
        """测试缺少必要参数"""
        mock_response = {
            "Response": {
                "Error": {
                    "Code": "InvalidParameter",
                    "Message": "A required parameter is missing."
                },
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups()
        assert "Response" in result
        error = result["Response"].get("Error", {})
        assert error
        assert error.get("Code") == "InvalidParameter"

    def test_invalid_region(self, mock_request):
        """测试无效区域"""
        original_region = CONFIG["region"]
        CONFIG["region"] = "invalid-region"

        mock_response = {
            "Response": {
                "Error": {
                    "Code": "InvalidParameterValue.RegionNotFound",
                    "Message": "The specified region does not exist."
                },
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups()
        assert "Response" in result
        error = result["Response"].get("Error", {})
        assert error
        assert error.get("Code") == "InvalidParameterValue.RegionNotFound"

        CONFIG["region"] = original_region  # 恢复原始配置

    def test_insufficient_permissions(self, mock_request):
        """测试权限不足"""
        original_secret_id = CONFIG["secret_id"]
        CONFIG["secret_id"] = "invalid-secret-id"

        mock_response = {
            "Response": {
                "Error": {
                    "Code": "AuthFailure.UnauthorizedOperation",
                    "Message": "You are not authorized to perform this operation."
                },
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups()
        assert "Response" in result
        error = result["Response"].get("Error", {})
        assert error
        assert error.get("Code") == "AuthFailure.UnauthorizedOperation"

        CONFIG["secret_id"] = original_secret_id  # 恢复原始配置

    def test_invalid_action(self, mock_request):
        """测试无效Action"""
        # 使用patch修改函数内部行为
        with patch('__main__.generate_signature', return_value='mock-signature'):
            mock_response = {
                "Response": {
                    "Error": {
                        "Code": "InvalidAction",
                        "Message": "The specified action does not exist."
                    },
                    "RequestId": "mock-request-id"
                }
            }

            mock_request.post(CONFIG["api_url"], json=mock_response)

            # 模拟修改Action参数
            original_action = describe_placement_groups.__globals__['describe_placement_groups'].__code__
            new_code = original_action.replace(co_consts=tuple(
                'InvalidAction' if const == 'DescribePlacementGroups' else const
                for const in original_action.co_consts
            ))
            describe_placement_groups.__globals__['describe_placement_groups'].__code__ = new_code

            try:
                result = describe_placement_groups()
                assert "Response" in result
                error = result["Response"].get("Error", {})
                assert error
                assert error.get("Code") == "InvalidAction"
            finally:
                # 恢复原始函数
                describe_placement_groups.__globals__['describe_placement_groups'].__code__ = original_action

    def test_invalid_version(self, mock_request):
        """测试无效版本号"""
        # 使用patch修改函数内部行为
        with patch('__main__.generate_signature', return_value='mock-signature'):
            mock_response = {
                "Response": {
                    "Error": {
                        "Code": "UnsupportedVersion",
                        "Message": "The specified version does not exist."
                    },
                    "RequestId": "mock-request-id"
                }
            }

            mock_request.post(CONFIG["api_url"], json=mock_response)

            # 模拟修改Version参数
            original_code = describe_placement_groups.__globals__['describe_placement_groups'].__code__
            new_code = original_code.replace(co_consts=tuple(
                'invalid-version' if const == '2017-03-12' else const
                for const in original_code.co_consts
            ))
            describe_placement_groups.__globals__['describe_placement_groups'].__code__ = new_code

            try:
                result = describe_placement_groups()
                assert "Response" in result
                error = result["Response"].get("Error", {})
                assert error
                assert error.get("Code") == "UnsupportedVersion"
            finally:
                # 恢复原始函数
                describe_placement_groups.__globals__['describe_placement_groups'].__code__ = original_code

    def test_invalid_limit_value(self, mock_request):
        """测试无效的Limit值"""
        mock_response = {
            "Response": {
                "Error": {
                    "Code": "InvalidParameterValue",
                    "Message": "The specified parameter Limit is not valid."
                },
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups(limit=-1)
        assert "Response" in result
        error = result["Response"].get("Error", {})
        assert error
        assert error.get("Code") == "InvalidParameterValue"

    def test_invalid_offset_value(self, mock_request):
        """测试无效的Offset值"""
        mock_response = {
            "Response": {
                "Error": {
                    "Code": "InvalidParameterValue",
                    "Message": "The specified parameter Offset is not valid."
                },
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups(offset=-1)
        assert "Response" in result
        error = result["Response"].get("Error", {})
        assert error
        assert error.get("Code") == "InvalidParameterValue"

    def test_exceed_max_limit(self, mock_request):
        """测试超过最大Limit值"""
        mock_response = {
            "Response": {
                "Error": {
                    "Code": "InvalidParameterValue",
                    "Message": "The specified parameter Limit exceeds the maximum value."
                },
                "RequestId": "mock-request-id"
            }
        }

        mock_request.post(CONFIG["api_url"], json=mock_response)

        result = describe_placement_groups(limit=101)  # 假设最大Limit为100
        assert "Response" in result
        error = result["Response"].get("Error", {})
        assert error
        assert error.get("Code") == "InvalidParameterValue"


def load_config(config_path: str) -> None:
    """从配置文件加载配置"""
    try:
        with open(config_path, 'r') as f:
            config = json.load(f)
            CONFIG.update(config)
    except FileNotFoundError:
        print(f"配置文件 {config_path} 不存在，使用默认配置")
    except json.JSONDecodeError:
        print(f"配置文件 {config_path} 格式错误，使用默认配置")


def run_tests(config_path: Optional[str] = None) -> None:
    """启动测试的函数"""
    if config_path:
        load_config(config_path)

    # 打印配置信息用于调试
    print("加载的配置信息:")
    for key, value in CONFIG.items():
        print(f"{key}: {value if key != 'secret_key' else '****'}")

    # 运行所有测试
    pytest.main([__file__, "-v"])


if __name__ == "__main__":
    # 可以通过命令行参数指定配置文件路径
    import sys

    config_path = sys.argv[1] if len(sys.argv) > 1 else None
    run_tests(config_path)